Perf. Tips Dart Drag Car

Im thinking its the cam thats running out.Its just a Edelbrock performer rpm cam.The heads are stock Econo W2's (unported).Its a 750 speed demon carb (mech. secondaries).With 76 jets in the primaries.I havent looked at the secondaries yet.I was thinking of a jet change ,but i didnt want to change too many things at one time ,before i ran it.If it slowed up ,i wouldnt know for sure what caused it.Now that i know my other changes didnt hurt it ,i am ready to start messing with the jetting and such.The reason i think its the cam is because its not cutting or falling off ,its just leveling out and not pulling as hard once i get to 6000 rpm or right about 75 feet before the end of the 1/4.The plugs were fresh this time out ,and they look perfect after 2 runs.Nice light tan ,and appear to be the correct heat range by the heat mark on the hook of the plug.I think the cam is something like a 480 lift .What do you think would be a good hydraulic upgrade for my combo ? Its a 10 to 1 motor ,that i would like to keep under 6500 rpm if possible.Im not out to set a world record ,just have sum fun and go fast for a long time ,without breaking too much .Here is a partial vid of my 11.71 run that my wife took.She didnt start filming till i was even with the tree though ,so i didnt get to see my launch.The thing that sounds like a Harley once i go past her ,is my oponet in the other lane finally getting traction and trying to catch me with a 14.86 run .Heres the vid link ...



http://www.youtube.com/watch?v=iR9WuEMm02o